Slide-valve



(No Model.) 2 Sheets-Sheet 1.

Z. T. RENO.

.SLIDE VALVE.

F|G4 O I O I FIG5 WITNESSES. INVENTOR.

(No Model.) 2 Sheets-Sheet 2.

Z. T. REN. SLIDE VALVE. No. 348,777. l Patented Sept. 7, 1886.

(b I L il I/l/ y WI'TNSSES |N\/ENTOR if ifm W2 J7 w NITED STATES PATENT OFFICE.

ZACHARY TAYLOR RENO, OF NEIV ORLEANS, LOUISIANA.

SLIDE-VALVE.

SPECIFICATION forming part of Letters Patent No. 348,777, dated September 7, 1886.

Application filed December 2l, 1885. Serial No. 186,363. (No model.)

To all whom it may concern.-

Be it known that I, Zaeimnv TAYLOR RENO, a citizen of the United States, residing at New Orleans, in the parish of Orleans and State of Louisiana, have invented a new and useful Imp rovement in Slide-Valves for Steam-Engines, 'of which the following is a speciiication.

My invention relates to improvements in slide-valves and the manner of admitting steam to them, so that the waterof condensation may largely free itself previous to passing through the slide-valve inthe cylinder; also ,to provide a balanced or nearly balanced slide-valve having a central steam-opening through it and having steain-pressurc top and bottom of the valve which works over the steam-ports and allows the steam to exhaust into the steamchest, into which high steam does not enter; also, to provide a valve and steam -ports in valve-seat of engine-cylinder that will permit a rapid discharge of exhaust-steam, which is especially desirable in locomotives and highspeed steam-engines. These objects are obtained by the mechanism shown in the accompanying drawings, in which like letters refer to like parts.

Figure l represents a longitudinal section through the slide-valve, the steam-chest, and steamports ofa steam-engine cylinder. Fig. 2 is a face view of valve-seat of engine-cylinder. Fig. 3 is the face view of the bottom of the slide-valve. Fig. 4 is a horizontal section of slide through line A B, Fig. l, and shows, also,the valve-seat under the valve with the relative position of valve and steam-ports in valve-seat at the end of extreme throw of valve. Fig. 5 is a similar view as Fig. 4, but shows the valve just beginning to admit steam and the relative size of exhaust-opening. Fig. G shows a longitudinal section of valve with a regulating-cock through it. Fig. 7 is a longitudinal section of part of a steamengine cylinder and piston and arrangement of double slide-Valves.

Steam enters steam-pipe C, Fig. l. At D is a short pipe turned and fitted so it will slide pipe C, the condensed water in the pipe is lower face of piston L presses an upper face of the valve N. The steam passes through holes 7.: in piston L, thence through hole O in valve.

N. The lower part of hole O is enlarged to just the extent that is necessary to make its area slightly less than the area of the inside of the piston L, so that the valveN may be nearly balanced,but held down by the greater pressure on top.

At l? Q, are the ports through which pass alternately high and exhaust steam. The steam exhausts into the steam-chest R and passes out through hole S.

At Fig. 4 the relative positions of valve N and openings I? and Q in valve-seat S are shown when wide open. The steam is entering opening Q and exhausting out of opening l) At Fig. 5 the relative positions of valve N and valve-seat S are shown when steam commences to enter and steam begins to exhaust. It will be seen that by the shapes of the openings in valve N and the openings F and Q, in

valve-seat that at all parts of the stroke the exhaust is larger than the steamopening,even if the valve be set without any lead on the exhaust. This is obtained by the combined curved and straight lines on same opening in valve-seat S,and the circular or curved shaped opening O in valve N.

I do not confine myself to using the hereindescribed valve N in combination with the described steam-openiugs in valve and valveseat, as the valve N can be used equally as well with parallelogram or other shaped openings in valve and valveseat; but I prefer the herein-described shapes. Nor do It coniine myself to using the described balance-valve N in combination with the described mechanism for removing condensed water from steampipe, as the valve N can be worked advantageously Without such mechanism as Well as with it, as shown at Fig. 7, in which the valve N of Figs. 1, 3, 4, 5 becomes valve Y.

Fig. 6 shows a cock, T, through hole O in valve N.

U is a socket-Wrench handle fastened to cock T, and passes through a stufIing-box in end of steam-chest, with a handle outside to regulate at will the ilow of steam immediately at the steam-openings P and Q.

Y is the valve-sten1.

This cook T in valve N will not be used generally; but I desire to show and describe the arrangement if I should ever desire to use it.

Fig. 7 shows part of a steam-engine cylinder, W, and piston X, and arranged for double valves Y Y and double valve pistons Z Z. The valves Y Y are connected together in any suitable way, as at a. The steam-pipe b branches to each steam-chest cover c. The steam passes in through holes d and holes c in valves Y.

The drawings at Fig. 7 show the steamport b receiving full opening of steam. The

port g is full open, through which the exhauststeam is passing out into the steam-chest h,

and thence escapes through hole i into escape-pipe.

Vhat I claim, and desire to secure by Letters Patent, is-

l. A. solid valve provided with a direct continuous steam-passage through it from top to bottom face, in combination with a piston and cylinder over the valve, the piston resting on top face of valve, substantially as described.

2. A solid slide-valve having a direct continuous central steampassage through it, in combination With steam-ports in valve-seat provided with straight and curved edges to each port for the purpose of obtaining a free and rapid exhaust, substantially as described. 3. The herein-described slide-valve N, .in combination with the piston L, the cylinder j, the spring I, and the piston D, provided with the holes II to allow the water of condensation to pass out of steam-pipe through drip-pipe I, substantially as described.

4ZACHARY TAYLOR RENO.

ViLnesses:

FREDERIC COOK, EDWARD J. BLANCHARD. 

